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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4c658533f997986705b31c05a1ea429264005184c82d3fe31f2d53f0c6d759' 
  AND token = 'wa4Nl1+Y58vIhS0avZSNLQt/9Ik2suFQL0j7aEIilBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}